[SI-LIST] Re: Impact of Probe -TDR Measurement - reducing the parasitic inductance
- From: Cosmin Iorga <ci249534@xxxxxxxxx>
- To: padma gundala <pgundala2001@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Mon, 13 Jul 2009 12:05:55 -0700 (PDT)
Padma,
You may be able to reduce this "parasitic" loop inductance with some
modifications and physical compensation added to the contact structure of your
connector on your existing board. A set of drawings or detailed pictures of
your current structure would help getting specific advice on what can be done.
If you consider fixing/compensating your current fixture to reduce this
parasitic inductance and you need some help send me drawings/pictures and TDR
waveforms and we can take it from there.
Cosmin Iorga, Ph.D.
NoiseCoupling.com
http://www.noisecoupling.com
________________________________
From: padma gundala <pgundala2001@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Sunday, July 12, 2009 9:52:44 PM
Subject: [SI-LIST] Impact of Probe -TDR Measurement
Hi ,
I'm making Characteristic Impedance measurements using TDR , of a connector
soldered to a test fixture. I'm using a Single ended probe . I find that at the
point of contact of probe on the pad, there is a inductive impedance approx.
78-82 ohms , Intially I thought I was measuring the impedance of the connector,
and then realised I was wrong.
I then tried to solder a co-ax cable to the pad . It is still shows a high
inductive impedance depending on the amount of solder at the joint.
Has anyone come across this? Do I need to look into the details of the probe
rating , bandwidth?
Thanks
Padma
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Other related posts:
- » [SI-LIST] Re: Impact of Probe -TDR Measurement - reducing the parasitic inductance - Cosmin Iorga
